Speech Recognition Power Board Circuit for Low-Noise Always Ready Mode
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Solution Overview
Problem
The Always Ready mode in speech recognition devices generates significant noise due to burst operations of the power board, which is difficult to mitigate without increasing component costs.
Innovation Solution
A power board that periodically operates switching elements and supplies a constant voltage to the main board in Always Ready mode, using a simple circuit to reduce noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If burst operation is used in standby mode to reduce power consumption, then power consumption is reduced, but voltage ripple and switching current increase causing noise
Solution Approach 1:
The power board employs periodic burst operation where switching elements are activated in cycles rather than continuously. This periodic activation reduces average power consumption while the switching frequency is optimized to minimize noise generation in coils, switches, and MLCCs.
Solution Approach 2:
The invention changes the operating parameters of the power board by adjusting switching frequency, duty cycle, and voltage levels during burst operation. These parameter modifications allow the system to maintain lower power consumption while controlling voltage ripple and noise within acceptable ranges.
2Reliability
If Always Ready mode is activated for continuous speech recognition standby, then speech recognition responsiveness is improved, but power consumption increases and noise problems occur
Solution Approach 1:
In Always Ready mode, the power board continues to use periodic burst operation rather than continuous operation. This maintains speech recognition responsiveness by keeping the system in standby state while periodically refreshing power delivery, thereby avoiding continuous noise generation from constantly active switching elements.
Solution Approach 2:
The system maintains continuous standby capability for speech recognition through Always Ready mode, ensuring the microphone and processing circuits remain powered. However, the power board uses periodic burst operation to achieve this continuity without requiring continuous high-power switching, thus reducing noise compared to full continuous operation.
3Object-generated harmful factors
If electrolytic capacitor is added to reduce voltage ripple in Always Ready mode, then noise is reduced, but component cost increases significantly
Solution Approach 1:
The invention optimizes switching frequency and duty cycle parameters to inherently reduce voltage ripple and noise generation. By carefully selecting operating parameters, the system achieves noise reduction without requiring expensive electrolytic capacitors, maintaining compatibility with cost-effective MLCC-based designs.
Solution Approach 2:
The power board design uses inexpensive MLCCs (multi-layer ceramic capacitors) instead of expensive electrolytic capacitors. Through optimized burst operation parameters, the system achieves noise reduction while maintaining compatibility with cheaper, shorter-lived MLCC components, avoiding the need for costly electrolytic capacitor upgrades.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Noise generation is significantly reduced in Always Ready mode with minimal cost increase by employing a power board that continuously operates switching elements with a constant voltage.
Implementation Method 1
a power board receiving a signal from the main board to activate an Always Ready (AR) mode that always stands by for speech recognition, under a standby mode that periodically operates switching elements, and supplying a constant voltage to the main board
Data Source
AI summary
The present disclosure is to improve noise in an always ready (AR) mode of a speech recognition device. The speech recognition device, according to embodiments of the present disclosure, may comprise: a main board; and a power board that under a ready mode in which switching elements are periodically operated, receives, from the main board, a signal for activating an AR mode for being always ready for speech recognition, supplies a certain voltage to the main board according to the received signal, and constantly operates the plurality of switching elements.